unprinted_designs = ["iphone case","robot pendant","dodecahedron"]
completed_models= []

while unprinted_designs:
    current_design = unprinted_designs.pop()
    print("Printing mode:"+current_design)
    completed_models.append(current_design)

print("\nThe following models have been printed")

for completed_model in completed_models:
    print(completed_model)